Improvement in hydraulic elevators



FRANK G. JOHNSON AND SAMUEL I. THURSBY, OF BROOKLYN, N. Y.

iMPROVEMENT IN HYDRAULIC ELEVATORS.

Specification forming part of Letters Patent No. 14S, E23, dated March3, 1874; application filed April 3, 1873.

To all whom t may concern:

Be it known that we, FRANK G. J onNsoN and SAMUEL I. THURsBY, both ofthe city of Brooklyn, in the county of Kings and State of New York, haveinvented certain Improvements in Hydraulic Elevators, of which thefollowing is a specication: l

Our improvement pertains to elevators for buildings, Sac., in which aseries` of telescopic tubes are extended, to raise a platformwhich theysupport, lthrough the agency of a Huid forced into them from below, asin the patent of E. F. Hope, No. 81,276, dated August 18, 1868, andconsistsviiprbviding against the entire displacement of one tube fromanother in case of accident to any of the collars or stops upon theinner ends ofthe movable tubes, by means of flanges or guides secured tothe top of each tube, (excepting that directly supporting the platform,)so that, should the end of one tube, from any cause, escape beyond thepacking-joint between it and the one in which it slides, it will bestill held in line, against lateral displacement, by the guideiiangeupon the tube in which it slides, said iiange being made so as to allowthe escape ot' the liquid through it from the interior of the tubing,under the circumstances stated, the effect of which is to cause thetubes to gradually descend into each other, a-nd thus prevent furtherdamage.

In the accompanying drawings, Figure 1 is a side elevation, illustratingthe arrangement of the apparatus 3 Fig. 2, a horizontal section in planeof line Fig. l; and Fig. 3, a vertical section, showing the arrangementof the guide-flange, &c.

The number of telescopic tubes, A A, employed is regulated according tothe height to which the platform is to be elevated. rlhose tubessituated between the platform B and the lower stationary tubeA, (intowhich the liquid first enters,) are guided and centralized by thevertical ways O O, through the medium of the horizontal cross-heads a a,which are rigidly aixed to the upper ends of said tubes A. The

ends of the cross-heads a are bifurcated, so as to clasp the guideways OO, as shown in Fig. 2, or otherwise formed to suitably bear against saidways, according to the construction ofthe latter. Guide-flanges D areaflxed to the upper ends of each of the tubes A A, excepting that whichdirectly supports the platform, to act as guides to the ends of thetubes, which they encircle, should the latter rise, from any cause,above the paekingjoint al between thetubes. These flanges or collarsDare hollow, and are perforated or otherwise formed to allow the escapeof liquid from them, and they extend up and encircle the tube next abovea sufficient distance to enable them to retain the end of said tubeagainst lateral displacement, if, by reason of the accidental detachmentof its ange or stop a2, it should escape beyond thepacking-joint, asabove mentioned, in which case the liquid would also rise into thecollar D, and from thence escape and allow the end of the tube todescend again into the tube next below.

The use of the cross-head a insures the alignment of the tube duringextension, and counteraets any tendency to lateral displacement, andconsequent friction and undue strain upon the packing box and jointemployed to render the tubing water-tight, and at the same timesimplifies the construction of the apparatus.

By the use of the guide-ilanges D, preserving the alignment of thetubing in case of accident, as stated, and providing for the graduallowering or closing of the tubing under such circumstances by the escapeof liquid from the interior of the tubing, the apparatus -is renderedmore safe and reliable.

Vhat we claim is- The guide-ilange D, arranged and constructedsubstantially as described, and for the purpose specified.

FRANK G. JOHNSON. SAML. I. THURSBY. Witnesses:

JOHN HAYES, B. E. GoLLIs.

ATENT CFFIGE'.

